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Molecular insights into RNA and DNA helicase evolution from the determinants of specificity for a DEAD-box RNA helicase

Journal Article · · eLife
DOI:https://doi.org/10.7554/elife.04630· OSTI ID:1628825
 [1];  [2];  [2]
  1. Univ. of Texas, Austin, TX (United States); DOE/OSTI
  2. Univ. of Texas, Austin, TX (United States)
How different helicase families with a conserved catalytic ‘helicase core’ evolved to function on varied RNA and DNA substrates by diverse mechanisms remains unclear. In this study, we used Mss116, a yeast DEAD-box protein that utilizes ATP to locally unwind dsRNA, to investigate helicase specificity and mechanism. Our results define the molecular basis for the substrate specificity of a DEAD-box protein. Additionally, they show that Mss116 has ambiguous substrate-binding properties and interacts with all four NTPs and both RNA and DNA. The efficiency of unwinding correlates with the stability of the ‘closed-state’ helicase core, a complex with nucleotide and nucleic acid that forms as duplexes are unwound. Crystal structures reveal that core stability is modulated by family-specific interactions that favor certain substrates. This suggests how present-day helicases diversified from an ancestral core with broad specificity by retaining core closure as a common catalytic mechanism while optimizing substrate-binding interactions for different cellular functions.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
National Institutes of Health (NIH); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1628825
Journal Information:
eLife, Journal Name: eLife Vol. 3; ISSN 2050-084X
Publisher:
eLife Sciences Publications, Ltd.Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (6)

Plasmodium falciparum specific helicase 3 is nucleocytoplasmic protein and unwinds DNA duplex in 3′ to 5′ direction journal October 2017
An aromatic-rich loop couples DNA binding and ATP hydrolysis in the PriA DNA helicase journal August 2016
The DEAD-box helicase Mss116 plays distinct roles in mitochondrial ribogenesis and mRNA-specific translation journal May 2017
A DEAD-box protein regulates ribosome assembly through control of ribosomal protein synthesis journal June 2019
Structure of the full kinetoplastids mitoribosome and insight on its large subunit maturation journal January 2020
Distinct RNA-unwinding mechanisms of DEAD-box and DEAH-box RNA helicase proteins in remodeling structured RNAs and RNPs journal November 2017

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